First test with my Spyder Hammer 7

Me and a buddy both got these for fun to do on weekends in between xball. gonna go play with them this weekend. got to shoot mine last night and the stock magazine was double and triple feeding and my paint was coming out like soup. switch to the 10 round mags and it shot fine. love the hammerhead barrel by the way. shot my month and a half old dimpled paint pretty straight. my buddy said his stock mag feeds fine. Has anyone else had their stock mag double feed like this?